问你社第五卷第十一期‘机械制造’所刊载的表面淬火一文,其中‘二、火焰淬火所適用的鋼料’一节内……除了碳鋼和低合金鋼外,各种鑄铁如含碳量为0.5至0.85％的灰口鐵……一段内所指出的碳份0.5至0.85％,是属于鋼的节疇,不知作者写0.5至0.85的灰口鑄鐵,其原意是什么?希望解释。上海倪天霖答在灰口鑄铁内的含碳量,是以二种不同的状熊而存在的,其中大部份是石墨组成的非金属部 Ask your society fifth volumes eleventh period ’mechanical manufacturing’ published in the text of a surface quenching, ’two, flame quenching applicable steel’ section ... ... In addition to carbon steel and low alloy steel, the various cast Iron such as gray iron with a carbon content of 0.5 to 0.85% ... The carbon content of 0.5 to 0.85% stated in the paragraph is a section of steel belonging to steel, I do not know the author to write 0.5 to 0.85 of gray cast iron, the original meaning of what Hope to explain. Shanghai Ni Tianlin A gray cast iron in the carbon content is based on two different bears exist, most of which are composed of non-metallic graphite